What is the primary role of mammary glands in mammals?

Environmental impacts on evolution : mastery test

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.